In ancient times, dogs were mainly ______helping people hunt( 打猎) .Now they are more useful-they can help the blinds, search for the bad eggs.
When you go without stopping at a place, it means you go _________.
The train was ________ of people. There was no empty seat.
—How did you get there?—I got there _______ bus.
Lily is looking forward to _______ her parents.
The journey was _______ interesting experiences.